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I get no grid display or density display of the seismics

It is probably the X server. In dGB-GDI V2.8, you will by default be using the Qt library-based viewers which support all display modes. Releases 2.7 and lower, however, have only the viewers based upon the Seismic UNIX viewers. These are 8-bit (PseudoColor) only.

Even with the old viewers, we do work on TrueColor display, with the kde window manager. But, for displaying grids and variable density seismics, we then switch to a second (extra) X server. If you work on Linux, this is what you need to do:
A - Make sure the following setup items are OK:

- Virtual console support (Try if you can <Ctrl-Alt-F1> and <Ctrl-Alt-F7>)

- The old fvwm (fvwm1) or twm installed. You cannot use fvwm2, kde or other color-guzzling window managers

B - Go to a text mode console with <Ctrl-Alt-F1> (or F2-F6)
C - Start your second X server from a script like:
      #!/bin/csh
setenv DISPLAY :1
xinit .xinitrc.fvwm -- :1 -bpp 8 &
You will now be warped into the new (second) X server. You can switch between the two servers with <Ctrl-Alt-F7> and <Ctrl-Alt-F8>. make sure that the DISPLAY is set to :1 when you start dGB-GDI in the 8-bit server.